Crank-shaft-grinding machine



Nov. 26, 1929. J. JOHANNESSEN CRANK SHAFT GRINDING MACHINE Filed March 51, 1928 2 SheetS-Sheet 1n ventor (f c/ 0%a/We av 7 1929. J. JOHANNESSEN 1,737,159

CRANK SHAFT GRINDING MACHINE Filed March 51, 1928 2 Sheets-Sheet 2 I Inventor Fatented Nov. 26, 1929 UNi'f'Eth SBTTES easier JOHANNES JOHANN'ESSEN, OF JERSEY CITY, NEW' JERSEY Application filed March 31, 1928.

shafts and the like.

Another very important object of the invention resides in the provision of a machine of this nature having suitable adjustments to accommodate difierent sized crank shafts and the. like.

A still further very important object of the invention resides in the provision of a machine of this nature which is simple in construction, strong and durable, easy to manipulate, compact and convenlent and thoroughly efficient and reliable in operation.

With the above and numerous other objects in view, as will appear as the description proceeds, the invention resides in certain novel features of construction, and in the combination and arrangement of parts as will be hereinafter more fully described and claimed.

In the drawing: Figure 1 is a front elevation of the machine embodying the features of my invention.

Figure 2 is a top plan view thereof.

Figure 3 is a sectional view of the slidable holder.

Figure 4 is a vertical transverse sectional view, taken substantially on the line &4 of

Figure 2, looking in the direction of the arrow.

Figure 5 is a detail elevation showing the crank disc and shaft therefor.

Figure 6 is a face view of the crank disc.

Figure 7 is a detail vertical section, taken substantially on the line 7-7 of Figure 2.

Figure 8 is a detail section taken substantially on the line 88 of Figure 3, and

Figure 9 is a detail elevation of the rocking uide. b Referring to the drawing in detail, it will be seen that the numeral 5 denotes a bed, along one longitudinal edge thereof rises therefrom a head stock 6, which is fixed to the bed, as at 7, and a tail stock 8, which is slidable in a T-slot 9, being adjustable by suitable conventional means 10. These stocks 6 and 8 are provided with live center pins 11 and 12 respectively.

A worm gear 14: is

Serial No. 266.206.-

rotatable about the dead center pin 11 and meshes with a worm 15, the shaft 16 of which is journaled in the bearings 17, on the base of the head stock 6. A lug 18 is formed on the worm gear 1% and has a screw 19 engaged therein for fixing a lazy dog 20 thereto. This lazy dog, of course, is clamped on crank shaft 21, which is mounted between the live center pins ii and 12, for rotation therebetween. A hand wheel 22 is mounted on the forward end of the shaft 16 for rotation thereof. A shaft is jonrnaled in a fixed bearing 2 f, on one the pair of the longitudinally extending guides 25. A gear 26, on one end of this ft 23 meshes with a pinion 27 on the rear an of the shaft 16. The rear end of the shaft J a crank disc 21 fixed thereto. One end s crank disc is provided with a dove groove 28 receiving a dove tailed slide which is held in adjusted position by means of set screw 80.

This slide 29 is provided with suitable indicia for the purpose of indicating the throw of the crank pin 31 thereon.

A block 32 is slidable along the V-guides 25 and has rising therefrom spaced ears 38, for rockably receiving therebetween one end of a rod 3a, the other end of which is engaged on the crank pin 31, so that when the crank disc is rotated, the block 32 reciprocates back and forth along the V-guides 25 on the bed 5.

A carriage 36 is also slidable on the V- guides 25 and has an opening 37 through which the connecting rod 34 moves. This carriage is provided with another opening to receive a rod 39, which is fixed to the block and is anchored in the opening 38 by means of set screws A0. This carriage is provided with a bore 1 for rockably receiving a pin d2, extending from a rocking guide having a dovetailed groove 43 therein. A holder A l is provided with a dove tailed end portion 15 siidable in the groove 43 and with a circuiar head 46, in the nature of a ring, formed two segments hinged together as at 43', and held in closed relationship by re leasable means 48. The crank pin of the crank shafts extends through the ring head 46, and guide pins 19 and 50 are mounted in the ring head, the pin 50 being spring pressed, as is indicated at 51 and the spring being adjustable by a screw 52.

A shaft 58 is journaled through a'sleeve 54, slidably mounted in the holder 44 and also through a bearing 55, engaged on the extrem ity of the dove-tailed end 45. On the end of the shaft=53, within the ring head 46 there is mountedlagrinding. element 56. The shaft 53 may be driven by a flexible shafting, from any suitable motor or the like, or the motor may be fixed to the extremity of the arm 45'.

A pocket 58 is provided in the holder 44, and

has rockable therein, as at 59, a gear segment 60, meshing with rack teeth 61 on the sleeve 54. A shank 62 projects from the gear segment: 60 and is: rockably, engaged, as at 63, witlila'sleeve 64threaded on arod 65, rotatable in=a lug 66, projectingifromthehead 46, andihavingizhandaactuating knob .67. By the ;rotationiof 'thisshaft 65., therefore, the gear segment 6'is =rocked,-to move the sleeve 54, so as to slide the shaft 53, thereby moving the grinding element 56, toward and away from the. c ank ofithe crankshaft 21;

The crankshaft QI i rotatably engaged on thezdead-cente pinsll: and 12, by adjusting the tailsocketS inthe usual well known manner. The ringhead 46 is engaged about the crank pin of the crank shaft 21, by swinging wopem the hinged segment thereof and the spring pressecbpin will cause the pins 49, 49'and 50 to properly hold the head 46 about the crank pin of the crank shaft andthen by turningthe knob 67-, the grinding element 351 maybe engaged with the crank pin-of the crank shaft.

Tlie oper-ator then turnsthe hand wheel 22, impartingreoipr'ocatory motion to the block 32 and simultaneously rotating the ag'crank shaft 21. The reciprocatory motion impartedto the block 32 is-imparted tothe car-riage 86 through the rod39 and-holder 44 therefore-:moves' back and forth along the crank'pin of the crankshaft and rocks as said 45: crankrevolves, thereby truing the crank pin. @bviously, the slide29 should be ad juste'd' tmaccommodxte the length of the crank pin, and this may be ascertained by tlieindicia provided on-said slide as clearly shown in Figure 6.

t is tliouglit that the construction, operation, utility and advantages of this invention will'now be quite apparent to those skilled r, in this art without a more detailed description thereof.

The present embodiment of the invention has. been disclosed in detail, merely for the purposesof exemplification, since it attains,

in:actualpractice, the'feat-ures of advantage enumerated asdesirable in the statement of the invention'iand the above description.

It willibeapparent that changes in the detailsof construction, and in the combination- 55; andiarrangement of parts-may be resorted to,

without departing from the spirit or scope of the invention as hereinafter claimed or sacrificing any of its advantages.

Having thus described my invention, what I claim as new is:

1. In a machine of the class described, a bed, a headstock and tail stock ontherbed, means for. adjustably mounting .the tailstock, said head stock and said tail stock being provided with live center pins, a gear rotatab'le on the live center pin of the head stock, a lazy dog-for driving the crank shaft from the gear, means for rotating the gear, a carriage. reciprocably mounted on the bed, a guide rockable on the carriage, a holder slidable. in the guide, azgrindingrelementtinitlie holder, means :for: associating; theholderiwittu the crank of the crank shaftr toimove there+= with, a shaft journaledin the. holder IfOlIQPBl'w ating said grinding element", and means;fori= reciprocatinglthe carriage through said:.gear rotating means. i I

2. In: a machine of the class described, a: bed, ahead stock and tail stock onzthe bed, means for adjustably mounting the tail:stock,. said headstock-and said tail'stockbeingprovided with live center pins, a gear: rotatable. on the live center pin ofthe headstock, ailazy dog for driving the crank shaft from the gear-,1 means for rotating the geargacarriage recip+= rocably mounted on the bed, aguide rockableonthe carriage, a-holder slidable inthe guide, a grinding element in the holder, means for associating the holder with I the crank of the-= crank shaft to-movetherewith, a shaft-journaled in the holder for operating said grinding element, andmeans for reciprocating thecarriage through said gear 'rotatingmeans, and means for adj listing thegrinding element.

3. In amachine of the class described, a bed; a head stock and tail stock on the bed, means for adj ustably mounting the tail stocksaid headstock andsaidtailstock beinglprovided withlive center pins, a gear-rotatableon the live center pin'of the head stock, a lazy dog for driving the crank shaft from the gear, means for rotatingithe gear, a carriage reciprocably mountedon tl'iebed, a guide rockable on the carriage, a holder slidable in the guide, a grindingelement inthe holder, means for associating the holder withtliecrank of-the crank shaftto move'tlierewith, a shaft journaled in the holder for operating said'grinding element, means for reciprocating the-carriage through said gearing rotatingmeans, means for adjusting the grindingelement, said means for reciprocating the carriage, comprising a block slidable onthe carriage, an adjustable connection between the block. and the carriage, a rod pivotally engaged with thecarriage,a crank disc,means-for rotatably, mountingthe crank;disc,,means for rotating the cranlcdisc from. the saidi gear'rotating: 180,

means, a slide adjustably mounted in the crank disc, means for holding the slide in different adjusted positions, and a crank pin extending from the slide and engaged With the rod.

In testimony whereof I aifix my signature.

JOI-IANNES JOHANNESSEN. 

